Tractor attachment



Oct. 27, 1931. G. GHISELLI TRACTOR ATTACHMENT Filed Aug. 5. 1929 f lul IIIIIIIIIIII INVENTOR.

a/Do 6x4/SELLA BY ma )Ldff A TTORNE YS.

vPatented Oct-27, 1931 UNITEDl STA-TES PATENT' oFFlcE:

GUIDoGHIsELLI, or FRANCISCO, CALIFORNIA Application led .August 3, 1929." Serial No. 383,401;

My invention relates to improvements in tractor attachments, and it consists in the combinations, constructions and arrangements hereinafter described and claimed.

In standard tractors it is the practice to apply a braking force to one Wheel when desiring to turn the tractor. The principal object of my invention is to cause the Wheel making the outer turn to rotate forwardly and the one making the inner turn to rotate rearwardly. This Will result in a quicker turning of the tractor.

The device still makes use of a kdifferential so as to adapt it to the ordinary movements in a forward or a rearward direction. The opposite tnrnings of the Wheels 4is accomplished only when the driver wishes to turn the tractor to the right or to the left.

A further object of my invention is to rovide a device of the type described whic is simple in construction and which is durable and efficient for the purpose intended. vThe device is designed especially for a tractor using an endless track-laying tread.

Other objects and advantages will appear as the specification proceeds, and the novel features of the device will be particularly pointed out in the claims hereto attached.

My invention is illustrated in the accompanying drawings, in which:

Figure 1 is a horizontal sectionthrough the device, and

Figure 2 is a section alongthe line 2 2 of Figure 1.

In carrying out my invention I make use of a drive shaft 1 that may be rotated in either vdirection by an engine (not shown) and by the arrangement of gears in a transmission indicated generally at 2. The shaft 1 rotates a stub shaft 3 by means of a universal joint 4 or other suitable connection. The shaft 3 carries a bevel gear 4, and the bevel gear meshes with a master gear 5. The gears 4 and 5 are housed Within a casin,

' and this casing supports rear axles 7 an A v.fiber washer 9 is placed between the abutting ends of the axles 7 and 8.

The master gear carries a differential cage 10, and this cage carries a differential s ider 11. The spider in turn carries small evel gearsy 12 that. mesh with bevel gears 13 and 14 keyed to the axles 7 and 8vrespectively. The arts thusflfar described are standard and crm nopart of my invention except insofar as theycooperate with the parts now to be described. f f

The right hand side of the casin y6 in Fig-` ure 1 is enlarged over the standar casing so as to house a ring gear 15 and a bearing 16. The 'ring gear 15 has an integral sleeve` 17 that; is feathered on as1eeve18 thatisintegral with the gear 14. yAs already stated, the gear 14 is keyed to the shaft 8, and it'will therefore be seenthat the ring gear l5 isA also keyed to the same shaft. The sleeve 17 is sup-` ported by the roller bearing. 16, and thebearing' in turn is carried bywebbingv19fthat extends to the lcasing 6.

Means is provided for causing lthe lring gear l5tomesh with theY gear 4 whenfit is desired to rotate the shaft 7 in one direction4k and the shaft 8in the opposite direction. When the gear 15 is out of meshvvithy the geark 4',

Y the parts will function as a standard differential. In Figure 2 I show a manually-controlled lever 2G that is designed to move a rod 21 in either directionalong its longitudinal axis. A ring 22l is rigidly securedto the rod 21 and has an inwardly-extending flange 23 that is rotatably received inan annular groove 24y of a collar 25. The collar is threaded on the sleeve 17 and is designed to move the sleeve longitudinally on the sleeve 18 when the lever 20 is actuated.

From the foregoing description of the various parts of the device, the operation thereof may be readily understood.

The shaft 1 normally rotates to the left as shown by the arrow in Figure 1 when the tractor is going in a forward direction. I have indicated the endless track-laying members by the dotted lin-es 26 and 27 that are dis-k posed at the ends of the shafts 7 and 8. If the operator wishes to turn the tractor quickly, he throws the lever 20 into the dotted line position shown in Figure 2. This causes the gear .15 to mesh With'the gear 4. If

the shaft 1 is rotating in the direction shown by the arrow in Figure 4l, the gear 15 willl rotate the shaft 8 in the direction shown by the arrow a. This will cause the track-laying member 27 to move rearwardly. At the same time, the gear 5 will mesh with the gear 4l and will cause the shaft 7 to rotate forwardly as shown by the arrow b. This will cafuse a quick turning of the tractor to the le t.

If the Operator desires to turn the tractor to the right, he first shifts the gearing in the transmission 2 to cause the shaft A1-to rotate in the opposite direction from that shown by the arrow. A subsequentshifting of the lever 20 into the dotted line position will cause the shaft 7 and 8 to rotate in directions opposite to that already described. rlhis will cause the tractor to turn to the right.

The rod 42l is shown 'slid-ably mounted in the,

beari'ngrshousing 16. Y

Althoughlhave shown `and described one embodiment of my invention, -I wish to have l'. itlunderstoodthat the same is susceptible of various changes, and I reserve the right to employ such changes as Inlay comeV within the scope of theinvention asv` claimed.

"I claim: f

.1. The combination with Aa differential for a trac-tor connected/to Stwo driven shafts, a drivingge'ar operatively connected to the differential, a gear having a sleeve slidably and non-rotatablymounted on one of said shafts, a bearingforsupporting the sleeve, and means for movingithelast named gear into and out of; meslrwitlr. the' driving gear, said means including a collar secured to the sleeve, .Y a ringirotatablelinthe collar, afrod secured to the ring and vbeing vslidable in a recess in the hearing,and a. lever connectedl to the rod for moving the rodi in the direction of its length. i 2. Incombination, adilerential housing, la shaft extending thereinto,a gear having 'a sleeve 'featheredtothesha-ft, ahearing `for the-,sleevexandhaving a recess, acoll-ar secureditot'he sleeve, a ring rotatably mountedin'; the collar, larod'connected to the ring andbein'g slidaible in the bore, said rodlprojecting eXteriorly of the housing, and a gearl i shift lever operatively connectedto the rod. VGUIDO GHISELLI. 

